Without any doubt, adaptation energy is not a sort of physical energy. Moreover, Selye
definitely measured the adaptation energy: the natural measure of it is the intensity and
length of the given stress from which adaptation can defend the organism before adaptability is exhausted. According to [1]}, “during adaptation to a
certain stimulus the resistance to other stimuli decreases”. In particular, he
demonstrated that “rats pretreated with a certain agent will resist such doses of this
agent which would be fatal for not pretreated controls. At the same time, their
resistance to toxic doses of agents other than the been adapted decreases below the
initial value.”
